Circuit-interrupter.



H. P. DAVIS & o. AALBORG.

CIRCUIT INTBRRUPTER.

APPLICATION FILED JUNE 25, 1'906.

Patented Jan, 5, 1915.-

4 SKEETB-SHEBT 1.

ATTORNEY warns nuns. mc Lum wnsmusm. D c

H. P. DAIS @L c. AALBQRG.

CIRCUIT INTBRRUPTBR. APPLIGATION FILED JUNE 25, 190e.

Patented Jan. 5, 1915.

4 SHEETS-SHEET 2.

WITNESSES:

|NVENTOR5` ATTORNEY H. 1.y DAVIS L C. AALBORG.

CIRCUIT INTBRRUPTER.

APl-*LICATION FILED JUNE 25. 1906.

Patented Jan. 5, 1915.

4 SHEETS-SHEET 3.

wnNEssEs:

QEQwA/Qrrfm INVENTQRS 5P, Sw

ATTORNEY H. P. DAVIS & G. AALBORG.

GIRCUI'T INTERRUPTBR. APPLICATION HLBD JUNE 25, 1906.

1,123,255. Patented Jan.5, 1915.

4 SHEETS-SHEET 1.

UNITED STATES PATENT OFFICE.

Harina' P. navi-sor PITTSBURGH, AND cHRIsTiANnaLBORG, OF wILKINsBURG, .PENNSYLVANIATASSIGNORS To WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY; A CORPORATION or PENNSYLVANIA.

CIRCUIT-INTEARRUPTER.

To all whom. it may` concern Be it knowpnlthat we, HAiiiiYiP. Davis and CHRISTIAN AALBona,'citizens-'of the United States, and residents, respectively, of Pittsburgh and AofWilkinsburg, in the county of Allegheny .andi State of Pennsylvania, have invented a newl and useful Improvement in Crcuitrlnterrupte'rs, of which the following is a specification.

Our invention; relates -to* .circuit-breakers and has speciali'eference yto such devices as are. adapted-to automatically interrupt cir-- cuits upontheoccuren eaof Vpredetermined conditions. y

mhe object-,Of our invention .-is to provide a circuit-breaker of the -class above indi cated, .which shall be simple land. durable 'in construction, electrically Operated, automaticallyactuated to interrupt the cii'cuitunder predetermined Y conditions and specially adapted for Outdoorservice. v

vIn theapplication of a relatively high voltage trolley line construction to-general railway service, it is desirable to vdivide the ilydisconnected from the source of supply trolley line into sectionswhich may be read- -1 so.. that repairs vmayfbe effected lWithout aforesaid objective results,

danger. `Circuit interrupters which are employed for this purpose-must be amply protectedfrom,weather'conditions and arranged so that the operating par-ts may be inspect-ed and repaired without dangerA of injury to the attendant- In order to accomplish the the circuitbreaker of our present invention is entirely inclosed in a water tight casing, is electricallyoperated and is provided with an' automatic tripping mechanism, which may be vactuated when thecurrent traversing the circuitscompleted through the switch exceeds aIpredetei-mined amount or when the cover of the-inclosing casing is removed orv moved to open lposition. 'The overload tripping device is so.v arranged that the elec-v tric `oper-ating' mechanism .will not close the switch v.when the trippingcoil is energized.`

rangement, arer connected to a second set of `Specii'ic'iatioii of lLetters Patent.

stationary members byA means. of' bridging.-

contact switch members that are vrelatively stationary and are supportedy `by and insulated from the cover. vThe second set of stationary terminal members .are connected Patented Jan. 5, 1915. Application iiled.l June 25, 1906. Serial No. 323,353. Y

to the line conductors and are so embedded ininsiilation that when the cover is open the exposed cont-act members are thoroughly ZICCOlTlconstructed in accordance therewith and Fig.

2 isa plan view of lthe interrupterwith the cover partially brokenaway.. -.Fig. 3 is a detail view ofthe coverhandle mechanism,

and Figs. 4 and 5 are, respectively, front" and side elevations fof *they Operating mechanism shown in Fig. 1.

Referring to the drawings-:the circuitinterrupter illustrated comprises vstationary Contact. members. 1, 2, -3 anda, movable 'bridging contact members 56 and 7, an inclosing casing 1 havinga hinged cover 9, a detachable fluid-containing tank. 10,` and an operatii'ig` mechanism 11. The stationary Contact members 2 .ind 4 comprising vertical Y rods 12 of conducting material, which are" attached to and insulated from the bottom of the casing 8 by means of molded insulating supportsA 13. The lower extremities of the rods 12 project from holes-iii the bottom ofthe casing and are providedwith terminal members 14, to-ivhiclrline conductors i'nay be attached. 'lhese'membersare .protected b v bell-shaped .insulators .15, which` are fitted into thelower :extremities of the insulators 13 and v'form' af-taperedplug and sleeve connection tl'ieieiv-ith.V The upper exti'einities of statioiiarymemhers-l and@ are provided with forked projections 1li-:uid 1T,`

extremities othe 'bridging contact members 5 -and6. T he'lower extremities of the members 1 and 3 vextend through suitable holes 1n the casing 8, from which they are separated by insulators20 and are provided with .resilient cup-shaped terminal members y 21 of a Well known constructiom'such as are shown and described nPatent No. 758,621,

Y:granted tdWestinghouse Electric &' Manu- ,tank 10is normally held in position .'Qmeansfof bifurcated projections 23 and supporting lbolts. .24', the-.upper extremities` 'oflvvhich extend intoi the' c-asing -8 and are provided with .bi ndingnuts 25. By. reason this A.consti-i1otio'n aridv arrangement of parts, 1tl lsimpossible for the current-carry,- A,pfglzontactparte. locatedv 1n the tank to be covered Auntilfthe-.cover 9 Iof the casing 351 been swun'glopenf to entirely discon- 'gectthese members fromthe v,supply cir- The upper'extremity ofthe link 26 is. `p ivotal.1yc,onnected. topa'clamp .27 that is attachdj-to and insulated from the operat- @lever-22.; ...1n this way, the operating echanismxll' is'exempt from any possiility of becoming-electrically connected to thesupplyl circuit.- A The. movable bridging contact lmembers 5 6.v comprise'switch blades which Vare `built'up .ofseveral strips 'of conducting material, au intermediate strip being shorter than theothers'so that a resilient connection maybe-maintained between theends of the bridgingv Contact members and `the rigid .Orked v terminals of the stationary members. The.;bridging contact members are relatively i stationary, both being'mounted upon insuthe cover-,9.

AThe -structure'thus 'far described is not claimed-herein but constitutes the subjectlatorsf28 that lare. attached to the inside of matterfof .a divisional application, Serial "Number 699,973,1ledMay 27, 1912.

e" The cover 9v is provided with a flange 9 fwhich overhangs the upper edge of the cas- `lng 8, so that water is prevented from run- 'ning into the casing, and vit is pivotally 'mounted upon h in'g'e pins 29, which are supported by 'forked projections 30 on the out- Side of the casing. In order to raise and lower the cover, which may be relatively heavy, a handle lever 31 -is pivotally mounted upon anstationaryshaft 32 that projects from'the sideof the casingandis connected to the cover 9 by means of a forked projection 33 and a link 34. The arrangement of partsyis such that the cover may be swung open through a predetermined angle and securely locked in such position until the handle lever is swung back through a small angl'e` to release it. y i

The operating mechanism' 11, which is mounted upon a stationary frame 35 attached to the casing 8, comprises an operating magnet 36, a bell crank lever 37 and a tripping magnet 38. The-operating lever22 is `fulcrumed upon a stationary shaft 39 that is mounted in the fraine 35 and at an intermediate p'oint in'its length, located between l the shaft 39 vand the point ofl connection 'with l the lever 37 by a-.link 41. The lever 37 is fulcrumed upon a stationary shaft 42 and is so arranged that movement of the lever l through a predetermined angle in the one or the other direction serves. to`,actuate .the op-A erating lever 22 and thereby move the bridging contact member 7 into and out of engagement with thewstationary contact mem` bers 21. The arm 43`of the lever 37 forms a it'is pivotally connectedfa latch 44. The operating magnet. 36 comprises a U-shaped stationary core member 45, upon which magv net coils 46 are mounte and a movable coremember 47 to which a magret yoke 48 is attached A" bifurcated lever 49 is 'fulcrumed at oneend upon the stationary shaft" the link 26, it is connected to one arm 40 of.

slightly obtuse angle with the arm 40 and'to 42 and is provided with a pin 51 `having a roller 50 to be engaged by a notch 52 inthe lower extremity of the magnet yoke 48 Which'm'ojects between thetiv'o parts of the lever 49. The'outer, extremity of thev lever 49 .is provided with a gib 53 which is normally engagedA by a notch 54 in the latch 44,

so that movement of the level 49, which is caused bv the movable member 47 of the magnet 36. is imparted tothe arm 43 of the extremity of the lever 22, and is provided with a hook 57 which normally engages the gib 53. The hook of the latch 55 is heldin engagement with the gib bv means of a sorine 58, which acts against an arm 59 of the latch. A third arm 60 of the latch 55 is enlarged at its outer extremity and is adanted to be engaged bv a. nroiection 61 on the inside `of the cover 9 when the cover vis slightly onen. The engagement of the nroiection 61 with the arm 60 ser"es to rotate the latch through a small angle in ormosition to the spring 58 and to disengage the hook 57 from the gib 53.' lVhen the gib is rethelmovable core member 47 of the magnet -36 is permitted to fall 'to the lower limit pf its path o-f'movement and carry with tithe levers 49 and 37, thereby permitting the: operating lever 22 to turnl upon the li139 v-gmdcause the circuit to be intertpted.-

' 44, the arrangement of parts being sephithat, whenthe tripping magnet is energi'zed the bell crank is moved, in opposition to-ispring 66,through a relatively small angle-andthe latch 44 is moved about its point of connection lwith the arm 43 of the rever 37, until it is disengaged from the gib "In-this Way, the operating `lever 22 is al- Iqfvveid'toifall' when the tripping` magnet is energized for any reason, and the circuit is interrupted, irrespective of the energizing orxdenergizing of the operating magnet 36. The latch releases the gib 53 when the linair'f"contact members ofthe interrupter are separated, `by reason of the engagement of a `projection 73 on the lever' 22 with the arm 5S of the latch. The fall of the movable core member47 is cushioned by means of springs.

:[Qivhich are attached, at one end, to sta` tibnary posts 71 and at the other end to the leser 49.. The sprin/gs are not essential ut-aredeSirable, since the weight of the core member may be considerable. An auxiliary 72 is mounted upon the frame 35 and comprises a single pole, double throw switch, themovable switch blade of which is moved from 'the'one position to the other as the movable core member 47 of thev operating magnet is raised or lowered. The auxiliary "viritchl may.. ofcourse, be located in any convenent vposition' and it may be found desirable 'to arrange the movable switch blade so that its position will be varied with the oprating lever 22 instead f with the core member 47.

The operation of the device is as follows: lssuming that the interrupter is closed, latches 44 and 55 both being in engagement liaithtlegib 53,;y if the tripping magnet 38 is energized, by reason of an overload or by 4any predetermined circuit conditions, either manually or automatically produced, the latch 44 Will be actuated` ashereinbefore in- (ligated, and the toggle `joint formed by the 40 (if-the lever 37 and the link 4l will collapse, This action permits the movable intact :members to' drop b v reason of their ight, thereby interrupting the main cirof the device. As the' operating lever 22 approaches its lowest position, the projection T3 engages arm 59 and moves the latch away from the gib 53. If an attempt is made, at this point, tto close the main circuit by energizing the operating `magnet winding 4G, the movable core member 47 will be heldup and no further result will be obtained until the winding is denergized. The core member 47, the yoke 48 andthe lever 49 will then drop and the gib 53 will be engaged by the latch 44. The interrupter may now be closed in the ordinary manner by energizing the magnet winding 46. The auxiliary switch 72 is not essential to the device but may be employed in the usual manner to disconnect the operating magnet winding from its source of' supply, when suflicient impetus has been imparted to the movable core member to effect the engagement of the latch 55 with the gib 53, in order to avoid lunnecessary loss of energy and heating in the operating coils.

Although I have shown a specific. structure, I desire that variations in size, form and arrangement of parts which do not ma.- terially change the mode of operation .or result shall be included withinthe scope of my invention, and that only suchllimitations shall be imposed as are indicated in theappended claims.

'We claim as our invention:

lfIn acircuit interrupter, the combination with stationary Contact members, movable contactmembers, an inclosing casing therefor, a cover foi-the casing and an operating electro-magnet, of means for automatically tripping the interrup-ter to open the circuit under overload conditions and when the cover is opened.

2. In a circuit interrupter, the combination with stationary Contact members, movable members, an inclosing casing therefor, a cover for the casing, an operating electromagnet, and a latch mechanism, of means for energizing the release magnet under predetermined conditions, and mechanical means for releasing the latchl mechanism when the cover is opened.

' 3. In a circuit interrupter, the combination with stationary Contact members, mov- 4able members, an inclosing casing therefor,

a cover for the casing, a tripping magnet, and a latch mechanism, of means for energizing the tripping magnet under predetermined conditions, and mechanical means for tripping the latch mechanism as the cover is opened, and means for preventing the closing of the circuit when the current traversing the tripping magnet exceeds a predetermined amount.

4. In a circuit interrupt/er, the combination with stationary contact members, movable members, an inclosing casing therefor, a cover for the casing, a trlpping magnet, and a latch mechanism, of means for energizing the tripping magnet under predetermined conditions, and mechanical-means for tripping the latch mechanism as the cover is opened, cooperating means detachably connected to the movable Contact member, and means for se ,-arating the two parts under predeteniined conditions.

5. In a circuit interruptor, the combination with an inclosing casing having a removable cover, stationary and movable contact members, an operating lever, an operating magnet, a gib operatively connected to the magnet, and a latch carried by the lever and engaging the gib, of a relatively sta` tionary latch also engaging the intermediate member, and means ldependent upon either the position of the lever or that of the casing cover for ,withdravwing'the stationary latch.

6. In a circuit interrupter, the combination with stationary Contact members, movable contact members and an inclosing casing therefor, a cover for the casing, an operating electro-magnet, and an `operating lever detachably connected to the movable core member of the operating magnet and permanently connected to the movablevcontact members for gravity-actuation to open-cir operating lever from the movable core member of the operating magnet to open the cirenit. under overload conditions and when the cover opened.

In a circuitinterrnpter, the combinaf tion with stationary and movable Contact members, an int-.losing casing therefor, a cover for the easing, an operating electromagnet, a movable core member therefor, and an operating lever interposed between the movable contact and magnet members, of a relatively stationary latch for *holding the movable core member in its energized position, and means for automatically disconnecting the operating `lever from the movable core member under predetermined conditions, and other means for Withdrawenit position, of means for disconnecting the l ing the latch, when the cover is opened, to

open the circuit. Y

In testimony whereof, weliave hereunto subscribed our'names this llth day of June,

HARRY P. DAVIS. CHRISTIAN AALBORG. lVitnesses l:

CAROLINE E. SMYEvs, E. R. SPENCER. 

